fix(apiWatch): handle implicitly any type in watch callback

vuejs · May 30, 2024 · 1042d9d · 1042d9d
1 parent 6ea95a4
commit 1042d9d
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Showing 2 changed files with 6 additions and 1 deletion.
diff --git a/packages/dts-test/watch.test-d.ts b/packages/dts-test/watch.test-d.ts
@@ -57,6 +57,11 @@ watch(readonlyArr, (values, oldValues) => {
   expectType<Readonly<[string, string, number]>>(oldValues)
 })
 
+// no type error, case from vueuse
+declare const aAny: any
+watch(aAny, (v, ov) => {})
+watch(aAny, (v, ov) => {}, { immediate: true })
+
 // immediate watcher's oldValue will be undefined on first run.
 watch(
   source,

diff --git a/packages/runtime-core/src/apiWatch.ts b/packages/runtime-core/src/apiWatch.ts
@@ -126,7 +126,7 @@ export function watch<
   Immediate extends Readonly<boolean> = false,
 >(
   sources: readonly [...T] | T,
-  cb: T extends { [ReactiveMarker]?: true }
+  cb: [T] extends [{ [ReactiveMarker]?: true }]
     ? WatchCallback<T, MaybeUndefined<T, Immediate>>
     : WatchCallback<MapSources<T, false>, MapSources<T, Immediate>>,
   options?: WatchOptions<Immediate>,